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� 1 <br /> KLEINFELDER <br /> soil samples collected and the screening results using a qualitative soil-vapor reacting <br /> instrument. Since field screening did eamot indicate <br /> s fromthe <br /> eachpresence <br /> of those boringsdweresnbmitton <br /> ed <br /> compounds in B-1 and B-2, the bottom ple <br /> for analysis. Positive readings were observed from the bottom sample from B-3 and was <br /> locations of the three borings with respect to a local <br /> selected for chemical analysis. The <br /> benchmark are provided on Table 1. <br /> 3.3 MONITORING WELL INSTALLATION <br /> On March 6 and 7, 1990, three monitoring wells were installed in accordance with the <br /> sampling work plan dated May 1, 1989. Regional ground water elevation maps indicated <br /> oring <br /> s were <br /> that ground water flaw direction was tothe northeast. e hat MW-Itwould belupgradient and <br /> based on regional ground water flow directions such t <br /> MW-3 would be downgradient of the excavation. MW-2 was installed at a location <br /> perpendicular to the assumed flow direction to provide the necessary data for calculating <br /> the on-site gradient. Well construction details are shown in Table 1,and their locations are <br /> shown on Plate 3. <br /> Generally, clays and clay-rich silts were encountered to a depth of approximately 10 or 15 <br /> feet below land surface. Below 10 to 15 feet, the soil changed to fine grained sands and <br /> t clayey sands. Water was encountered at a <br /> wash of encountered oattaldepthefeet below of approximate y <br /> surface in MW-1 and MW-2. Ground water as <br /> 14 feet below land surface in MW-3. Well logs are included in Appendix C. More specific <br /> protocol for installation of monitoring wells is presented in Appendix B. <br /> 3.4 MONITORING WELL.DEVELOPMENT AND SAMPLING <br /> On March 13, 1990, the three monitoring wells were developed to set the sand pack. <br /> volumes <br /> Development was performed using a Teflon <br /> bailer. �nprot. �Ve]Itely 12 development protocol36 <br /> gallons) were purged from each well during p <br /> is <br /> described in Appendix B. Well development logs are shown in Appendix D. <br /> On March 16,-1990, the.three..monitoring wells were purged to obtain a sample of water __.. <br /> _ representative of formation water. Approximately four to five well va utnes of water <br /> a Teflon bailer prior to the collection o a samp <br /> B.le Purge logs <br /> purged from the wells using <br /> are contained in Appendix D. Sampling protocol is described in App <br /> tr15-90-101 <br /> d <br /> copyright 1990 Kleinfetder, Inc. <br /> __, <br />